Gas burner with forced combustion air



March 24,1953 M. A. HELLER ETAL u 2,632,502 GAS BURNER WITH FORCED COMBUSTION AIR Filed April 28, 195o v 2 SHEETS- Smm 1 Y \\\\\\\\\\\\\\\\\\Y S -\\\\\\\\\\\\`\\\\\\\\\\\\MQ .IN VEN TOR.

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firme/ver M. A. HELLERA ET AL GAS BURNER WITH FORCED COMBUSTION AIR March 24, 1953 2 SHEETS-SHEET 2 Filed April 28, 1950 HG. Z IN V EN TOR. /VaX/ /ZeM/zd mw 5 /mwu/ ATTORNEY Patented Mar. 24, 1953 5..;

uNl'lraD STATES eArsNT ortica?? p 2,632,502- .i .i

" das BURNERWITHORCEooMBUSfrroN u IR s l Max A. Heller and Angelo J. Conti, Denver,`Colo. Y`

.`.Application aprilizs, 1950,] serga1'NoL158,738 p i e claims. (c1. 15s-fiom This invention .relates to improvements in gas burners of the type employed for heating bui1d 1ngs.,. y,

Q Where natural gas hasbecome ,available for heating, ithas been quite generally adopted because it is cleanery and more economical than other. fuels.

Before natural gas became available many heating plants were lconverted from coal `burning to oilburning. Oil', although it is cleanerand more convenientthan coal, `has some objection,- ab'lefeatures that are absent in gas fuel,v and besides, ithas been found that natural gas is more economical'than oil. Y

-Many installations now burning oil are being converted to natural gas.

` It is, of course, highly desirable that the conversion from oil to gas shall be made as simple as possible so that theL conversion can be eiTected quickly and at a minimum cost.

It is the object of this invention to produce a gas burner, of the forced draft type,so designed and constructed that it will fit almost any furnace that has been adapted for the burning of oil, and which can therefore be substituted for an ordinary oil burner with practically no alterations in the furnace. y

It is a further object to produce a gas conversionburner so designed that it will be entirely self-contained and pre-wired so that it will require only to be connected with the gas supply, the electric supply andwith the thermostat.

` A further object is to produce a burner of such construction that the primary air is supplied under pressure, entirely independent of the auxiliary air, and in which the quantity of primary air can be conveniently regulated separate from the auxiliary air.

Another object is to produce a burner f such construction that the principal part thereof is comprised of a single casting. i i

Another object is to produce a burner in which the main gas control valve and the pressure reducing and control valve are both positioned above the burner in such positions that they may be conveniently controlled and regulated.

A further object is to produce a burner of the class described in which the burner head or nozzle is of such a construction that it discharges the gasfina broad jet which produces a wide lflat name, and which has a mixing chamber termihating-in ahead having an axial openingfor the gas supply. pipe and orice andopenings for primaryair.v

Astill furtherobjectis to produce a burner of such construction that the pilot burner and thermoco'uple or "equivalentsafety devices are posi# tioned below the main name' 'and so' constructed that this `assembly may be readily removed for` inspection and/or repair, the pilot burner beingV in a positionwhere the ame can be viewed from the outside.. i

Theabove and other 'objects that may become apparent as this description, proceeds are alt` Figure 3 is a top plan view of the gas nozzle,

parts being broken away and shown in section to.

better disclose the construction;

" Figure'4 is a view taken' on plane"4-4, Fig-- ure 1;

Figure 4a is asection showing the orifice to an enlarged scale; j Figure 5 is a perspective view of the burner; Figure 6 is a rear end'elevation looking in the direction of arrow B in Figure 5; and

Figure '7 is a Wiringdiagram. i

' Vv'In'the drawing, reference numeral Hl desig-Y nates -the burner casing as a Whole. Reference numeral Hdesignates the tubular burner housing, IZIthe fan housing, and I3 the primary air chamber wliose under surface has a thickened portion or hub I4 providedwith a threaded opening 'for the reception of the upper threaded end of support pipe I5, to `thej lower .end of which a basell is attached. 1t will be observed that the primary air `chamber has the cross sectional shapeof a square with rounded corners, instead of being cylindrical like the burner housing. Platev I1 is secured to the side walls ofthe primary air chamber, and held in place byscrews I3. Y

Platejll forms the bottom wall of thevprimary air chamber and divides the space into an upper and a lower conripartment.V A removable cover I9 closes an opening in the rear wall or the primary upper compartmentof the air chamber. lOpposite sideVv `Valls off the primary air chamber are provided With-'notches or'opnings 20' as shown'in Fig-urea, for apurpose that 'will later appear. Burnerhead or nozzle 2 I' comprises'a'singlel castingha'vingfa tubularlmixin'g section`22 that te'rminates .in alaterallyflaring; nozzle portion 23, the opening -in which, when.. viewed as in Figure 2, is hourglass-shaped. The other end of the nozzle terminates in a square portion 24 having a transverse opening 25 for the admission of primary air. The end wall of part 2li has an opening 26 for the reception of the end of gas pipe 21, which is provided with a removable orifice member 28. The gas supply line has been designated by numeral 29 and connects with the gas shut-off cock 30. A short pipe 3| extends from cock 30 to the pressure regulator 32. From the pressure regulator, pipe 33 extends downwardly to gas valve 34 that closes automatically whenever the pilot ame goes out. From 34, pipe 35 extends to a pipe fitting cross 36 from which it extends to and is connected with the pressure control switch 38 that controls the operation of motor M and transformer T. The pilot burner and the safety thermostat element have been designated by reference numeral 39, but no attempt has been made to show the details of the construction because they, together with valve 36, are available on the market and have been incorporated in this burner to perform their usual function. Instead of the usual thermal couple, this device employs a .mercury filled element that generates a pressure which is communicated to valve 36 by pipe 4B.

Referring now to Figures 1 and 3, it will be observed that nozzle 2| is provided with flanges di that contact the inner surface of burner housing Il and which with the body of the nozzle and plate I7, delimits an auxiliary air passage G2. The nozzle is in addition provided with an upwardly extending flange 43 that engages the inner wall of the burner housing and prevents air escaping from the primary air chamber. Nozzle 2| ,is secured in position by means of .two screws 44 as shown in Figure l. 1

A pin or screw 45 extends through the mixing tube 22 and serves to split the gas stream to facilitate the spreading thereof as it enters the flaring nozzle. The side walls of the fan housing are provided with openings 46. Attached to the outer surface of the fan housing in concentric relation with openings 4S is bearing 41 which is attached to ring 43 by radiating spokes 49. Screws 50 secure this bearing to the fan housing. A fan rotor or impeller (not shown) of the Sirocco type is mounted on the motor shaft l. The opening in the opposite side wall of the fan housing is partially closed by a similar wheellike plate to the hub of which a bolt 52 is connected and projects outwardly. An air regulating disk 53 is threadedly connected with the bolt and is heldin adjusted position by nuts 54.

Motor M is attached to the wheel-like member whose rim has been designated by numeral 48 and is attached thereto by bolts 5,5 and springs 5.6. As above stated, the fan impeller is carried by the motor shaft. The .quantity of air that enters the fan .and is delivered by it to the burner as primary air is controlled by the position of disk 53.

Referring now `to -Figure 4a, which is an enlargement of that part of the gas pipe 21 shown in section in Figure 4, it will be seen that the oriice member 28 is so connected with pipe 2l that it may -be inserted and removed through the pipe fitting cross 3B.

The burner is provided with all of the standard automatic controls and safety devices, which are connected with the burner in such a way that the electric wiring may be done at the factory, thereby 'simplifying and expediting the installation.

Let .us now assume that the tubular burner housing il is positioned so as to open into the combustion chamber of a furnace, that valve 30 is connected to the gas supply pipe 29, and that conductor 58 is connected with the electric supply. The pilot burner is ignited, and if the thermostat is adjusted the motor will start and gas will ow into the nozzle, primary air will enter through opening 25, and auxiliary air will enter through passage 42. rl'he amount of primary air is controlled by the position of plate 53. The auxiliary air iiows through passage @2 below plate i7 and the nozzle.

If the orifice becomes clogged or must be replaced by one of different capacity, the plug at the rear end of the cross pipe filling 36 is removed and the orifice is unsorewed by using a screwdriver.

Attention is directed to the fact that the housing, including the fan housing and the burner housing, is a unitary casting.

Attention is called to the fact that the pilot burner and thermo responsive element or thernro-couple are positioned underneath the main flame where they are both protected from the intense heat to which they would be subjected if positioned above the main burner. Another feature is that opening 42 through which the auxiliary air enters is unobstructed and this permits the pilot flame to be viewed from the outside by looking through the open air passage.

The pipe that conducts gas to the pilot burner and the connections to the thermo responsive device are readily removable without disturbing other parts of the burner, and therefore repairs and/or replacements can readily be made.

Another important feature is that the air supply for the pilot dame is independent of the primary air supply and this assures that any danger that the pilot arne might be extinguished accidentally is reduced to a minimum.

Having described the invention, what we claim as new is:

l. In a gas burner, in combination, a hollow burner body comprising an elongated tubular portion of substantially cylindrical shape having a horizontal axis, a fan housing at one end, a rotary impeller in the housing, the outlet opening of the fan housing communicating with the tubular portion near one end thereof, means comprising a plate attached to the wall of the burner body dividing it into two compartments, the compartment above the plate forming a primary air chamber and a lower compartment, a tubular burner nozzle having its rear end positioned on the plate, said nozzle having means engaging the sides and the top of the inner surface of the tubular member, which in combination with the plate delimits the primary air chamber, means for introducing a viet of gas into the rear end of the burner nozzle, the latter having lateral openings adjacent the point where the gas is introduced, for the admission of .primary air, a pilot burner and a heat responsive control element adjacent to the discharge end of the burner nozzle, a passage for auxiliary air being formed in the cylindrical body below the plate and nozzle, and means for adjusting the quantity of primary air delivered bythe fan to the primary air chamber, said nozzle extending from the front portion of the plate towards the outlet end of the cylindrical body.

2. A `gas burner in accordance with claim l in which both ends of the elongated tubular portion are open and in which that portion of the rear end wallthat is Vabove the plate is formed in part by a removable closure plate leaving that portion below said plate open.

3. A gas burner in accordance with claim l in which that portion of the tubular burner nozzle forwardly of the lateral openings has a cylindrical mixing passage that terminates in an outwardly flaring opening of transversely oblong cross section adapted to deliver an outwardly flaring transversely oblong flame.

4. A fuel gas burner comprising in combination, a unitary hollow burner body terminating in anfelongated tubular portion having a horizontal axis, a fan housing whose air delivery port communicates with the interior of the tubular portion adjacent one end thereof, a plate extending across the interior of the hollow body adjacent the fan discharge opening, dividing it into an upper primary air chamber and a lower compartment forming an auxiliary air passage, a removable plate forming the rear end wall of the primary air chamber, the rear ends of the side walls of the hollow burner body having inwardly extending notches directly above the plate for the reception of a gas pipe, an elongated burner nozzle having its fuel receiving end resting on the plate and extending from the front portion of the plate to the outlet end of the tubular portion, means supporting the nozzle, the upper surface of the nozzle having a transverse flange fitting the interior of the tubular portion, the sides having longitudinal lateral anges contacting the inner surface of the tubular portion, whereby a primary air chamber is delimited, the end in the burner nozzle in the primary air chamber having a transverse opening for the admission of primary air, the nozzle having an opening extending its entire length, means for discharging a jet of gas into the nozzle at the transverse opening, the nozzle opening terminating in an outwardly aring portion of transversely oblong cross section for delivering a flattened stream of combustible fuel.

5. A gas burner in accordance with claim 4 wherein the auxiliary air passage is substantially straight and extends between the ends of the body, whereby a ame issuing from the burner nozzle may be viewed from the rear open end of the auxiliary air passage while the means for varying the primary air is adjusted.

6. A gas burner in accordance with claim 4 wherein a pilot burner is positioned'at the discharge end of the burner nozzle underneath the same, in position to be cooled by air flowing through the auxiliary air passage and in which the pilot burner may be removed through said passage.

MAX A. ANGELO J. CONTI.

-REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 466,127 Olsen Dec. 29, 1891 1,367,704 Justice Feb. 8, 1921 12,221,519 Jones Nov. 12. 1940 2,263,170 Haedke Nov. 18, 1941 

